Knob for an appliance



FIG. 1 is a perspective view of a knob for an appliance showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof. 

CLAIM The ornamental design for a knob for an appliance, as shown and described. 